1. Main line 1. d4 Nf6 2. c4 c5 3. d5 e6 Choose a line 1. Main line 1. d4 Nf6 2. c4 c5 3. d5 e6 2. Snake Variation 1. d4 Nf6 2. c4 c5 3. d5 e6 4. Nc3 exd5 5. cxd5 Bd6 Close 1. Main line 1. d4 Nf6 2. c4 c5 3. d5 e6 2. Snake Variation 1. d4 Nf6 2. c4 c5 3. d5 e6 4. Nc3 exd5 5. cxd5 Bd6 Next